Here we have clock keys in all the sizes available. We get many calls asking what key their clock takes and over the phone it is difficult to say you need key size this or that. Best to read the below text on how to use the clock keys chart and get the correct sized key to wind your clock. What can be said is most larger German movements take a number 8 key. So if your clock movement is made in Germany, is 5 x 5 square or 6 x 9, it will take a number 8 usually. If the clock movement is made in Germany and it's round or a small rectangle it's usually number 4. If you have a 31 day clock, or a Korean clock, or a commonly produced early American time strike movement, then it's usually number 7. However, if you want to be sure with all this then use the below chart.
To get the key you need, measure the shaft the key is to go on to, then use this chart to get the key size # you need. Please do not call asking what key your clock needs, as you will be told it would still have to be measured. Again, you are measuring the shaft that the key goes onto in MM and then using the below chart.
1 CM = 10 MM
25.4 MM (2.54 CM) = 1 inch
German clocks (post 1960) take a number 8 or 4 key
Four most popular double end clock keys. There is always much confusion for people to get the proper double end key, so we offer this set of 4 keys most frequently used. These have the Small end for regulating some clocks as well as the end to wind.
Item #CK2-- $19
Available in 0 to 13. This crank is usually used for the OGee mantle clock.
These two 5 prong clock keys will cover just about every clock winder.
Item #CK8 -- $19
Available in all sizes. Please use the key size chart on the top of the page.
#8 Key -fits most Large Hermle model clocks, #4 Key -fits most Small Hermle model clocks.